Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended												12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	[1]	Sep. 30, 2021	[2]	Jun. 30, 2021	[3]	Mar. 31, 2021	[4]	Dec. 31, 2022	Dec. 31, 2021
Weighted average common shares outstanding–basic (in shares)	10,725,662	10,695,867	10,653,268	10,617,271	10,580,431		10,496,188		10,442,916		10,329,449		10,673,017	10,462,246
Unvested shares of restricted stock and employee stock options (in shares)													189,521	267,616
Weighted average common shares and common share equivalents outstanding–diluted (in shares)	10,928,220	10,864,540	10,814,799	10,842,592	10,836,396		10,792,290		10,764,936		10,525,826		10,862,538	10,729,862
Average number of potentially dilutive securities excluded from calculation (in shares)													478,024	231,938

[1] The quarter ended December 31, 2021 includes a recovery of $17 of restructuring and other charges which are discussed in Note 5.

[2] The quarter ended September 30, 2021 includes $51 of restructuring and other charges which are discussed in Note 5.

[3] The quarter ended June 30, 2021 includes $197 of restructuring and other charges which are discussed in Note 5.

[4] The quarter ended March 31, 2021 includes $55 of restructuring and other charges which are discussed in Note 5.