CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings
Balance at beginning (in shares) at Jun. 30, 2019		16,433,128,000	(295,615,000)
Balances at beginning at Jun. 30, 2019	$ 26,126	$ 165	$ (1,554)	$ 29,020	$ (1,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	19,350	19,350,000
Exercise of stock options	$ 58			58
Stock-based compensation	225			225
Issuance of restricted stock (in shares)		72,000,000
Issuance of restricted stock	0	$ 1		(1)
Net income	1,656				1,656
Balance at end (in shares) at Dec. 31, 2019		16,524,478,000	(295,615,000)
Balances at end at Dec. 31, 2019	28,065	$ 166	$ (1,554)	29,302	151
Balance at beginning (in shares) at Sep. 30, 2019		16,442,328,000	(295,615,000)
Balances at beginning at Sep. 30, 2019	$ 26,944	$ 165	$ (1,554)	29,152	(819)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	10,150	10,150,000
Exercise of stock options	$ 30			30
Stock-based compensation	121			121
Issuance of restricted stock (in shares)		72,000,000
Issuance of restricted stock	0	$ 1		(1)
Net income	970				970
Balance at end (in shares) at Dec. 31, 2019		16,524,478,000	(295,615,000)
Balances at end at Dec. 31, 2019	28,065	$ 166	$ (1,554)	29,302	151
Balance at beginning (in shares) at Jun. 30, 2020		16,667,572,000	(295,615,000)
Balances at beginning at Jun. 30, 2020	$ 29,578	$ 168	$ (1,554)	30,203	761
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	68,531,000	68,531,000
Exercise of stock options	$ 311	$ 1		310
Stock-based compensation	302			302
Issuance of restricted stock (in shares)		63,599,000
Issuance of restricted stock	0	$ 1		(1)
Net income	935				935
Balance at end (in shares) at Dec. 31, 2020		16,799,702,000	(295,615,000)
Balances at end at Dec. 31, 2020	31,126	$ 170	$ (1,554)	30,814	1,696
Balance at beginning (in shares) at Sep. 30, 2020		16,718,103,000	(295,615,000)
Balances at beginning at Sep. 30, 2020	$ 29,672	$ 169	$ (1,554)	30,589	468
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	18,000,000	18,000,000
Exercise of stock options	$ 86			86
Stock-based compensation	140			140
Issuance of restricted stock (in shares)		63,599,000
Issuance of restricted stock	0	$ 1		(1)
Net income	1,228				1,228
Balance at end (in shares) at Dec. 31, 2020		16,799,702,000	(295,615,000)
Balances at end at Dec. 31, 2020	$ 31,126	$ 170	$ (1,554)	$ 30,814	$ 1,696