Stock Option - Activity (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
2012 Employee Stock Option Plan
Options
Outstanding, beginning of year			214,080	235,680	235,680
Granted	338,000	0	338,000	0
Forfeited/Lapsed				0
Exercised	(23,000)	0	(28,000)	0
Outstanding, end of period	524,080	235,680	524,080	235,680	214,080
Exercisable, end of period	160,576	95,600	160,576	95,600
Weighted average exercise price
Weighted average exercise price, bgn			$ 9.59	$ 9.42	$ 9.42
Granted (per share)			23.17
Forfeited/Lapsed (per share)				0
Exercised (per share)			5.54
Weighted average exercise price, end	$ 18.56	$ 9.42	18.56	9.42	$ 9.59
Exercisable, end of period, weighted average exercise price	$ 15.06	$ 7.33	15.06	$ 7.33
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.16
Total intrinsic value of options exercised			$ 485,000
Total intrinsic value of options outstanding	$ 3,367,000	$ 963,000	3,367,000	$ 963,000
Total intrinsic value of options exercisable	$ 1,595,000	$ 590,000	$ 1,595,000	$ 590,000
2012 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			12,000	24,000	24,000
Granted	9,600	0	9,600	0
Forfeited/Lapsed				0
Exercised	0	0	0	0
Outstanding, end of period	21,600	24,000	21,600	24,000	12,000
Exercisable, end of period	11,760	17,040	11,760	17,040
Weighted average exercise price
Weighted average exercise price, bgn			$ 6.55	$ 5.15	$ 5.15
Granted (per share)			22.93
Forfeited/Lapsed (per share)				0
Exercised (per share)			0
Weighted average exercise price, end	$ 13.83	$ 5.15	13.83	5.15	$ 6.55
Exercisable, end of period, weighted average exercise price	$ 8.28	$ 4.54	8.28	$ 4.54
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58
Total intrinsic value of options outstanding	$ 241,000	$ 191,000	$ 241,000	$ 191,000
Total intrinsic value of options exercisable	$ 197,000	$ 146,000	$ 197,000	$ 146,000
2018 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			70,100	96,800	96,800
Granted	23,500	0	23,500	0
Forfeited/Lapsed				0
Exercised	(3,000)	0	(3,000)	0
Outstanding, end of period	90,600	96,800	90,600	96,800	70,100
Exercisable, end of period	41,260	37,280	41,260	37,280
Weighted average exercise price
Weighted average exercise price, bgn			$ 11.93	$ 11.74	$ 11.74
Granted (per share)			22.93
Forfeited/Lapsed (per share)				0
Exercised (per share)			11.68
Weighted average exercise price, end	$ 14.79	$ 11.74	14.79	11.74	$ 11.93
Exercisable, end of period, weighted average exercise price	$ 12.96	$ 11.22	12.96	$ 11.22
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58
Total intrinsic value of options exercised			$ 39,000
Total intrinsic value of options outstanding	$ 924,000	$ 202,000	924,000	$ 202,000
Total intrinsic value of options exercisable	$ 496,000	$ 98,000	$ 496,000	$ 98,000
2020 Non-Employee Stock Option Plan
Options
Outstanding, beginning of year			10,000	0	0
Granted	16,900	0	16,900	10,000
Exercised	0	0	0	0
Outstanding, end of period	26,900	10,000	26,900	10,000	10,000
Exercisable, end of period	7,380	2,000	7,380	2,000
Weighted average exercise price
Weighted average exercise price, bgn			$ 11.40	$ 0	$ 0
Granted (per share)			22.93	11.40
Weighted average exercise price, end	$ 18.64	$ 11.40	18.64	11.40	$ 11.40
Exercisable, end of period, weighted average exercise price	$ 16.68	$ 11.40	16.68	11.40
Additional disclosures
Weighted average fair value at grant date of options granted			$ 12.58	$ 6.10
Total intrinsic value of options outstanding	$ 171,000	$ 17,000	$ 171,000	$ 17,000
Total intrinsic value of options exercisable	$ 61,000	$ 3,000	$ 61,000	$ 3,000