BASIS OF PRESENTATION - Condensed Consolidated Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020
CURRENT ASSETS
Cash	$ 41,162	$ 27,767
Accounts receivable, net	9,847	9,738
Inventory	7,272	6,114
Contract asset	27	20
Prepaid and other current assets	1,756	1,459
TOTAL CURRENT ASSETS	60,064	45,098
PROPERTY, PLANT AND EQUIPMENT, net	10,508	10,843
OPERATING LEASE RIGHT OF USE ASSET	7,919	8,353
FINANCING LEASE RIGHT OF USE ASSET, net	934	907
INVENTORY, net of current portion	982	989
OTHER ASSETS	118	110
GOODWILL	6,735	6,735
INTANGIBLE ASSETS, net	2,109	2,239
DEFERRED TAX ASSET, net	584	157
TOTAL ASSETS	89,953	75,431
CURRENT LIABILITIES
Accounts payable	2,972	2,922
Accrued liabilities	4,472	3,940
Operating lease liability	2,240	2,368
Financing lease liability	174	160
Current maturities of long-term debt	622	735
Contract liability	5,965	7,028
TOTAL CURRENT LIABILITIES	16,445	17,153
CONTRACT LIABILITY, net of current portion	1,352	1,461
OPERATING LEASE LIABILITY, net of current portion	5,810	6,118
FINANCING LEASE LIABILITY, net of current portion	772	741
OTHER LIABILITIES	44	45
LONG-TERM DEBT, net of current portion	3,236	3,329
TOTAL LIABILITIES	27,659	28,847
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common Stock, $0.01 par value	197	176
Treasury stock, at cost, 295,615 shares repurchased	(1,554)	(1,554)
Additional paid-in capital	51,363	34,333
Retained earnings	12,288	13,629
TOTAL STOCKHOLDERS' EQUITY	62,294	46,584	$ 29,672	$ 29,578
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 89,953	$ 75,431
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Treasury stock, shares repurchased (in shares)	295,615	295,615
As Previously Reported
CURRENT ASSETS
Cash	$ 41,162
Accounts receivable, net	9,847
Inventory	7,272
Contract asset	27
Prepaid and other current assets	1,756
TOTAL CURRENT ASSETS	60,064
PROPERTY, PLANT AND EQUIPMENT, net	10,508
OPERATING LEASE RIGHT OF USE ASSET	7,919
FINANCING LEASE RIGHT OF USE ASSET, net	934
INVENTORY, net of current portion	982
OTHER ASSETS	118
GOODWILL	6,735
INTANGIBLE ASSETS, net	2,109
DEFERRED TAX ASSET, net	413
TOTAL ASSETS	89,782
CURRENT LIABILITIES
Accounts payable	2,972
Accrued liabilities	3,750
Operating lease liability	2,240
Financing lease liability	174
Current maturities of long-term debt	622
Contract liability	5,965
TOTAL CURRENT LIABILITIES	15,723
CONTRACT LIABILITY, net of current portion	1,352
OPERATING LEASE LIABILITY, net of current portion	5,810
FINANCING LEASE LIABILITY, net of current portion	772
OTHER LIABILITIES	44
LONG-TERM DEBT, net of current portion	3,236
TOTAL LIABILITIES	26,937
STOCKHOLDERS' EQUITY
Common Stock, $0.01 par value	197
Treasury stock, at cost, 295,615 shares repurchased	(1,554)
Additional paid-in capital	51,363
Retained earnings	12,839
TOTAL STOCKHOLDERS' EQUITY	62,845
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	89,782
Restatement Adjustment
CURRENT ASSETS
Cash	0
Accounts receivable, net	0
Inventory	0
Contract asset	0
Prepaid and other current assets	0
TOTAL CURRENT ASSETS	0
PROPERTY, PLANT AND EQUIPMENT, net	0
OPERATING LEASE RIGHT OF USE ASSET	0
FINANCING LEASE RIGHT OF USE ASSET, net	0
INVENTORY, net of current portion	0
OTHER ASSETS	0
GOODWILL	0
INTANGIBLE ASSETS, net	0
DEFERRED TAX ASSET, net	171
TOTAL ASSETS	171
CURRENT LIABILITIES
Accounts payable	0
Accrued liabilities	722
Operating lease liability	0
Financing lease liability	0
Current maturities of long-term debt	0
Contract liability	0
TOTAL CURRENT LIABILITIES	722
CONTRACT LIABILITY, net of current portion	0
OPERATING LEASE LIABILITY, net of current portion	0
FINANCING LEASE LIABILITY, net of current portion	0
OTHER LIABILITIES	0
LONG-TERM DEBT, net of current portion	0
TOTAL LIABILITIES	722
STOCKHOLDERS' EQUITY
Common Stock, $0.01 par value	0
Treasury stock, at cost, 295,615 shares repurchased	0
Additional paid-in capital	0
Retained earnings	(551)
TOTAL STOCKHOLDERS' EQUITY	(551)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 171